/* ============================================
   Min Thant Ko — Portfolio Stylesheet
   Clean white · Blue palette · Premium feel
   ============================================ */

:root {
  --white: #FFFFFF;
  --blue-100: #E0F4FF;
  --blue-300: #87C4FF;
  --blue-500: #39A7FF;
  --blue-700: #004577;
  --blue-900: #001B30;
  --text: #2F2F2F;
  --text-secondary: #4a6275;
  --text-muted: #6b8499;
  --section-alt: #F8FAFC;
  --border: rgba(0, 69, 119, 0.1);
  --shadow-sm: 0 2px 14px rgba(0, 27, 48, 0.05);
  --shadow-md: 0 8px 32px rgba(0, 27, 48, 0.08);
  --shadow-lg: 0 20px 50px rgba(0, 27, 48, 0.1);
  --radius: 12px;
  --radius-lg: 18px;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-heading: 'Outfit', system-ui, sans-serif;
  --nav-height: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue-500); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-700); }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 100px 0; background: var(--white); }
.section-alt { background: var(--section-alt); }

.section-header { text-align: center; margin-bottom: 56px; }

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-500);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--blue-900);
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--text-muted);
  max-width: 520px;
  margin: 12px auto 0;
  font-size: 0.98rem;
  line-height: 1.6;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.15s; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  border: 1.5px solid transparent;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
}

.btn-primary {
  background: var(--blue-700);
  color: var(--white);
  border-color: var(--blue-700);
}
.btn-primary:hover {
  background: var(--blue-900);
  border-color: var(--blue-900);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--blue-700);
  border-color: var(--border);
}
.btn-outline:hover {
  background: var(--blue-100);
  border-color: var(--blue-300);
  color: var(--blue-700);
  transform: translateY(-2px);
}

.btn-sm { padding: 9px 18px; font-size: 0.85rem; }

.ripple-btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}
@keyframes ripple { to { transform: scale(4); opacity: 0; } }

/* ---- Navigation ---- */
.header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 1000;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 32px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  transition: transform var(--transition);
}

.nav-logo:hover {
  transform: scale(1.03);
}

.nav-logo-img { width: 36px; height: 36px; border-radius: 8px; object-fit: cover; }

.nav-logo-text {
  display: inline-flex;
  align-items: baseline;
}

.nav-logo-primary,
.nav-logo-accent {
  transition: color 0.35s ease;
}

.nav-logo-primary { color: var(--blue-900); }
.nav-logo-accent { color: var(--blue-500); }

.nav-logo:hover .nav-logo-primary { color: var(--blue-500); }
.nav-logo:hover .nav-logo-accent { color: var(--blue-900); }

.nav-menu { display: flex; align-items: center; gap: 4px; }

.nav-link {
  position: relative;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 50px;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  width: 0; height: 2px;
  background: var(--blue-500);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-link:hover, .nav-link.active { color: var(--blue-700); }
.nav-link:hover::after, .nav-link.active::after { width: 22px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 8px;
  flex-shrink: 0;
  z-index: 1003;
  position: relative;
}
.nav-toggle:hover { background: var(--blue-100); }

.hamburger-line {
  display: block;
  width: 100%; height: 2px;
  background: var(--blue-900);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active .hamburger-line:nth-child(2) { opacity: 0; }
.nav-toggle.active .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 27, 48, 0.35);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 1001;
}
.mobile-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: min(300px, 86vw);
  height: 100%;
  height: 100dvh;
  background: var(--white);
  box-shadow: var(--shadow-lg);
  padding: calc(72px + env(safe-area-inset-top, 0px)) 28px calc(28px + env(safe-area-inset-bottom, 0px));
  transform: translateX(110%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1002;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  pointer-events: none;
}
.mobile-menu.active {
  transform: translateX(0);
  pointer-events: auto;
}

.mobile-close {
  position: absolute;
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: 16px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 1.2rem;
}
.mobile-close:hover { background: var(--blue-100); color: var(--blue-700); }

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.mobile-nav-link {
  display: block;
  padding: 14px 16px;
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--blue-100);
  color: var(--blue-700);
}

.mobile-social {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.mobile-social a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--blue-700);
  transition: all var(--transition);
}
.mobile-social a:hover {
  background: var(--blue-700);
  border-color: var(--blue-700);
  color: var(--white);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-decor { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }

.decor-circle {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--blue-300);
  opacity: 0.3;
}

.decor-circle--1 { width: 380px; height: 380px; top: -90px; right: -70px; animation: float 8s ease-in-out infinite; }
.decor-circle--2 { width: 200px; height: 200px; bottom: 12%; left: -55px; background: var(--blue-100); border: none; opacity: 0.55; animation: float 6s ease-in-out infinite reverse; }
.decor-circle--3 { width: 70px; height: 70px; top: 32%; left: 42%; animation: float 9s ease-in-out infinite; }

.decor-line {
  position: absolute;
  background: linear-gradient(90deg, transparent, var(--blue-300), transparent);
  height: 1px;
  opacity: 0.35;
}
.decor-line--1 { width: 280px; top: 24%; right: 8%; transform: rotate(-12deg); }
.decor-line--2 { width: 180px; bottom: 28%; left: 4%; transform: rotate(18deg); }

.decor-shape {
  position: absolute;
  border: 1px solid var(--blue-300);
  opacity: 0.25;
}
.decor-shape--1 { width: 22px; height: 22px; top: 18%; right: 28%; transform: rotate(45deg); animation: float 7s ease-in-out infinite; }
.decor-shape--2 { width: 14px; height: 14px; bottom: 22%; right: 12%; border-radius: 50%; animation: float 5s ease-in-out infinite reverse; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-14px) rotate(4deg); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-greeting { font-size: 1rem; font-weight: 500; color: var(--blue-500); letter-spacing: 0.05em; margin-bottom: 8px; }

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 5.5vw, 3.75rem);
  font-weight: 700;
  color: var(--blue-900);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 12px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.8vw, 1.65rem);
  font-weight: 500;
  color: var(--blue-700);
  margin-bottom: 24px;
  min-height: 2.1em;
}

.typing-cursor { color: var(--blue-500); animation: blink 1s step-end infinite; font-weight: 300; }
@keyframes blink { 50% { opacity: 0; } }

.hero-desc { color: var(--text-secondary); max-width: 540px; margin-bottom: 32px; font-size: 1rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }

.hero-social { display: flex; gap: 12px; }

.hero-social a {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--blue-700);
  font-size: 1rem;
  transition: all var(--transition);
}
.hero-social a:hover {
  background: var(--blue-700);
  border-color: var(--blue-700);
  color: var(--white);
  transform: translateY(-3px);
}

.hero-visual { display: flex; justify-content: center; }

.hero-image-frame { position: relative; width: min(360px, 100%); }

.hero-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.hero-image-ring {
  position: absolute;
  inset: -15px;
  border: 2px solid var(--blue-300);
  border-radius: calc(var(--radius-lg) + 8px);
  opacity: 0.35;
  z-index: -1;
}

/* ---- About ---- */
.about-card {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  align-items: start;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.about-image-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.about-image { width: 100%; aspect-ratio: 4/5; object-fit: cover; }

.about-intro {
  font-size: 1.08rem;
  font-weight: 500;
  color: var(--blue-700);
  margin-bottom: 16px;
}

.about-bio { color: var(--text-secondary); margin-bottom: 28px; }

.education-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.edu-item {
  padding: 16px;
  background: var(--section-alt);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: center;
}

.edu-item h4 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 6px;
  line-height: 1.4;
}

.edu-item p { font-size: 0.8rem; color: var(--text-muted); }

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--blue-100);
  border-radius: var(--radius);
  border: 1px solid rgba(135, 196, 255, 0.35);
}

.info-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.info-label i { margin-right: 5px; color: var(--blue-500); }
.info-value { font-weight: 600; color: var(--blue-900); font-size: 0.92rem; }

/* ---- Skills ---- */
.skills {
  position: relative;
  overflow: hidden;
}

.skills::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 69, 119, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 69, 119, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, #000 20%, transparent 75%);
  pointer-events: none;
}

.skill-category { margin-bottom: 44px; position: relative; }
.skill-category:last-of-type { margin-bottom: 24px; }

.skill-category-title {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--blue-700);
  margin-bottom: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 12px;
}

.skill-category-title::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--blue-500);
  flex-shrink: 0;
}

.skill-category-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

.capabilities { margin-bottom: 52px; position: relative; }

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(0, 69, 119, 0.14);
  border: 1px solid rgba(0, 69, 119, 0.14);
  overflow: hidden;
}

.capability-card {
  position: relative;
  background: var(--white);
  border: none;
  border-radius: 0;
  padding: 32px 28px 28px;
  box-shadow: none;
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  grid-template-areas:
    "icon title"
    "icon desc";
  column-gap: 16px;
  row-gap: 6px;
  transition: background 0.35s ease;
  overflow: hidden;
}

.capability-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--blue-500);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.capability-card:hover {
  background: linear-gradient(105deg, var(--blue-100) 0%, var(--white) 55%);
}

.capability-card:hover::before { width: 3px; }

.capability-card .skill-icon {
  grid-area: icon;
  align-self: start;
  margin-top: 2px;
}

.capability-card h4 {
  grid-area: title;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 0;
  color: var(--blue-900);
  position: relative;
  z-index: 1;
}

.capability-card p {
  grid-area: desc;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  position: relative;
  z-index: 1;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(0, 69, 119, 0.14);
  border: 1px solid rgba(0, 69, 119, 0.14);
  overflow: hidden;
  counter-reset: skill;
}

.skills-grid--2 { grid-template-columns: repeat(2, 1fr); max-width: none; }
.skills-grid--4 { grid-template-columns: repeat(4, 1fr); }

.skill-card {
  position: relative;
  background: var(--white);
  border: none;
  border-radius: 0;
  padding: 28px 22px 24px;
  box-shadow: none;
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  grid-template-areas:
    "icon title"
    "icon desc";
  column-gap: 14px;
  row-gap: 4px;
  transition: background 0.35s ease;
  counter-increment: skill;
  overflow: hidden;
  min-height: 132px;
}

.skill-card::before {
  content: counter(skill, decimal-leading-zero);
  position: absolute;
  top: 10px;
  right: 12px;
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: rgba(0, 69, 119, 0.1);
  line-height: 1;
  pointer-events: none;
  transition: color 0.35s ease, transform 0.35s ease;
}

.skill-card::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--blue-500);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-card:hover {
  background: linear-gradient(105deg, var(--blue-100) 0%, var(--white) 58%);
}

.skill-card:hover::before {
  color: rgba(0, 69, 119, 0.16);
  transform: translateX(-4px);
}

.skill-card:hover::after { width: 3px; }

.skill-icon {
  grid-area: icon;
  width: auto;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border-radius: 0;
  font-size: 1.55rem;
  color: var(--blue-700);
  margin: 0;
  align-self: start;
  margin-top: 2px;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), color 0.35s ease;
  position: relative;
  z-index: 1;
}

.skill-card:hover .skill-icon,
.capability-card:hover .skill-icon {
  transform: translateY(-2px) scale(1.08);
  color: var(--blue-900);
}

.skill-card h4 {
  grid-area: title;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 0;
  position: relative;
  z-index: 1;
  letter-spacing: -0.01em;
}

.skill-card p {
  grid-area: desc;
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.55;
  position: relative;
  z-index: 1;
  max-width: 28ch;
}

.tech-list {
  padding: 22px 0 0;
  background: transparent;
  border: none;
  border-top: 1px dashed rgba(0, 69, 119, 0.22);
  border-radius: 0;
  margin-top: 28px;
}

.tech-list p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.tech-list p:last-child { margin-bottom: 0; }

/* ---- Projects ---- */
.projects {
  position: relative;
  overflow: hidden;
}

.projects::before {
  content: '';
  position: absolute;
  top: 10%;
  right: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 167, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.projects-panel {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(57, 167, 255, 0.18);
  border-radius: calc(var(--radius-lg) + 4px);
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .projects-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }
}

.project-card {
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--white);
  border: 1px solid rgba(57, 167, 255, 0.14);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0, 27, 48, 0.04);
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(57, 167, 255, 0.14);
  border-color: rgba(57, 167, 255, 0.35);
}

.project-card.is-hidden { display: none; }

/* Extra projects — open / close collapse */
.projects-extra-collapse {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}

.projects-extra-collapse.is-open {
  grid-template-rows: 1fr;
}

.projects-extra-collapse.is-closing {
  grid-template-rows: 0fr;
}

.projects-extra-inner {
  overflow: hidden;
  min-height: 0;
}

.projects-extra-grid {
  padding-top: 24px;
}

.projects-extra-collapse .project-extra {
  opacity: 0;
  transform: translateY(28px) scale(0.97);
  transition: opacity 0.45s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.projects-extra-collapse.is-open .project-extra {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.projects-extra-collapse.is-open .project-extra:nth-child(1) { transition-delay: 0.08s; }
.projects-extra-collapse.is-open .project-extra:nth-child(2) { transition-delay: 0.16s; }
.projects-extra-collapse.is-open .project-extra:nth-child(3) { transition-delay: 0.24s; }
.projects-extra-collapse.is-open .project-extra:nth-child(4) { transition-delay: 0.32s; }
.projects-extra-collapse.is-open .project-extra:nth-child(5) { transition-delay: 0.4s; }

.projects-extra-collapse.is-closing .project-extra {
  opacity: 0;
  transform: translateY(-16px) scale(0.98);
  transition-delay: 0s !important;
}

.projects-extra-collapse.is-closing .project-extra:nth-child(5) { transition-delay: 0s !important; }
.projects-extra-collapse.is-closing .project-extra:nth-child(4) { transition-delay: 0.05s !important; }
.projects-extra-collapse.is-closing .project-extra:nth-child(3) { transition-delay: 0.1s !important; }
.projects-extra-collapse.is-closing .project-extra:nth-child(2) { transition-delay: 0.15s !important; }
.projects-extra-collapse.is-closing .project-extra:nth-child(1) { transition-delay: 0.2s !important; }

.project-card.project-item-popup {
  animation: projectPopup 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes projectPopup {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.project-image {
  position: relative;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.project-image--0 { background: linear-gradient(145deg, #e8f6ff 0%, #d4ecff 50%, #f0f9ff 100%); }
.project-image--1 { background: linear-gradient(145deg, #dceeff 0%, #c5e4ff 50%, #eaf5ff 100%); }
.project-image--2 { background: linear-gradient(145deg, #e0f4ff 0%, #b8dcff 50%, #f5fbff 100%); }
.project-image--3 { background: linear-gradient(145deg, #d6ebff 0%, #a8d4ff 50%, #edf7ff 100%); }

.project-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(255, 255, 255, 0.85) 0%, transparent 55%);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.project-card:hover .project-image-overlay { opacity: 1; }

.project-card:hover .project-image-icon {
  transform: scale(1.08);
  background: rgba(255, 255, 255, 0.55);
}

.project-image-icon {
  position: relative;
  z-index: 1;
  width: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 8px 24px rgba(57, 167, 255, 0.12);
  transition: transform 0.35s ease, background 0.35s ease;
}

.project-image-icon i {
  font-size: 1.6rem;
  color: var(--blue-700);
}

.project-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 22px 22px 24px;
}

.project-body h3 {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 10px;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.project-card:hover .project-body h3 { color: var(--blue-700); }

.project-body p {
  flex: 1;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.7;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 18px;
  list-style: none;
  padding: 0;
}

.project-tags li {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 11px;
  background: var(--blue-100);
  color: var(--blue-700);
  border-radius: 50px;
  border: 1px solid rgba(57, 167, 255, 0.2);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.project-card:hover .project-tags li {
  background: rgba(224, 244, 255, 0.9);
  border-color: rgba(57, 167, 255, 0.35);
}

.project-links {
  margin-top: auto;
  padding-top: 4px;
}

.btn-github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  padding: 11px 18px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-700);
  background: linear-gradient(135deg, rgba(224, 244, 255, 0.9), rgba(255, 255, 255, 0.9));
  border: 1px solid rgba(57, 167, 255, 0.28);
  border-radius: 50px;
  transition: all 0.35s ease;
}

.btn-github:hover {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  border-color: transparent;
  box-shadow: 0 6px 24px rgba(57, 167, 255, 0.3);
  transform: translateY(-1px);
}

.btn-github svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  transition: transform 0.35s ease;
}

.btn-github:hover svg { transform: scale(1.12); }

.projects-toggle-wrap {
  display: flex;
  justify-content: center;
  margin-top: 28px;
  padding-top: 8px;
}

.projects-toggle-btn {
  gap: 10px;
  padding: 13px 36px;
  font-weight: 600;
  border-color: rgba(57, 167, 255, 0.35);
  background: var(--white);
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.projects-toggle-btn.is-expanded {
  background: var(--blue-100);
  border-color: var(--blue-500);
}

.projects-toggle-btn:hover {
  background: var(--blue-100);
  border-color: var(--blue-500);
}

.projects-toggle-btn i {
  transition: transform var(--transition);
}

.projects-toggle-btn.is-expanded i {
  transform: rotate(180deg);
}

@media (max-width: 639px) {
  .projects-panel { padding: 18px; }
  .project-image { height: 140px; }
}

/* ---- Experience Timeline ---- */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue-300), var(--blue-500), var(--blue-700));
  border-radius: 2px;
}

.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -40px; top: 8px;
  width: 16px; height: 16px;
  background: var(--white);
  border: 3px solid var(--blue-500);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--blue-100);
  z-index: 1;
}

.timeline-content {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.timeline-content:hover { box-shadow: var(--shadow-md); }

.timeline-duration {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--blue-500);
  background: var(--blue-100);
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.timeline-content h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 6px;
}

.timeline-company { font-weight: 600; color: var(--blue-700); margin-bottom: 6px; }
.timeline-location { font-size: 0.88rem; color: var(--text-muted); }
.timeline-location i { margin-right: 6px; color: var(--blue-500); }

/* ---- Contact ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 52px;
  align-items: start;
}

.contact-profile {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-profile img {
  width: 72px; height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--blue-300);
}

.contact-profile h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--blue-900);
  margin-bottom: 2px;
}

.contact-profile p { font-size: 0.88rem; color: var(--text-muted); }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 28px;
}

.contact-list li { display: flex; align-items: flex-start; gap: 14px; }

.contact-icon {
  width: 46px; height: 46px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--blue-100);
  border-radius: 10px;
  color: var(--blue-700);
  font-size: 1.05rem;
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.contact-list a, .contact-list span { font-weight: 500; color: var(--blue-900); }
.contact-list a:hover { color: var(--blue-500); }

.contact-social {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.contact-social a {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--blue-700);
  transition: all var(--transition);
}
.contact-social a:hover {
  background: var(--blue-700);
  border-color: var(--blue-700);
  color: var(--white);
}

.contact-form {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 13px 16px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(57, 167, 255, 0.12);
}

.form-group input.error,
.form-group textarea.error { border-color: #e74c3c; }

.form-error {
  display: block;
  font-size: 0.78rem;
  color: #e74c3c;
  margin-top: 6px;
  min-height: 1.1em;
}

.form-success {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--blue-100);
  color: var(--blue-700);
  border-radius: var(--radius);
  font-weight: 500;
  text-align: center;
}

.btn-submit { width: 100%; position: relative; }
.btn-submit.loading .btn-text { opacity: 0; }
.btn-submit.loading .btn-loader { opacity: 1; }

.btn-loader {
  position: absolute;
  width: 22px; height: 22px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  opacity: 0;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Footer ---- */
.footer {
  padding: 56px 0 28px;
  border-top: 1px solid var(--border);
  background: var(--section-alt);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--blue-900);
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  max-width: 280px;
}

.footer-social { display: flex; gap: 10px; flex-wrap: wrap; }

.footer-social a {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--blue-700);
  background: var(--white);
  transition: all var(--transition);
}
.footer-social a:hover {
  background: var(--blue-700);
  border-color: var(--blue-700);
  color: var(--white);
}

.footer-links-wrap h4,
.footer-contact-wrap h4 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--blue-900);
  margin-bottom: 16px;
}

.footer-nav { display: flex; flex-direction: column; gap: 10px; }

.footer-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--blue-500); }

.footer-contact-wrap p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  overflow-wrap: anywhere;
  word-break: break-word;
  display: flex;
  align-items: flex-start;
  gap: 4px;
  line-height: 1.5;
}
.footer-contact-wrap i {
  color: var(--blue-500);
  margin-right: 8px;
  width: 16px;
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ---- Back to top ---- */
.back-to-top {
  position: fixed;
  bottom: 30px; right: 30px;
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--blue-700);
  color: var(--white);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden;
  transform: translateY(14px);
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--blue-900); transform: translateY(-4px); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .section { padding: 80px 0; }
  .skills-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .about-card { grid-template-columns: 260px 1fr; gap: 32px; padding: 32px; }
  .education-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; text-align: center; margin-top: 30px; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-social { justify-content: center; }
  .hero-visual { order: -1; }
  .hero-image-frame { width: min(280px, 75%); }
  .about-card { grid-template-columns: 1fr; }
  .about-image-wrap { max-width: 280px; margin: 0 auto; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .capabilities-grid { grid-template-columns: 1fr; }
  .skills-grid, .skills-grid--4 { grid-template-columns: repeat(2, 1fr); }

  .navbar { padding: 0 20px; }
  .nav-menu { display: none; }
  .nav-toggle { display: flex; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-brand p { max-width: 420px; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .section { padding: 64px 0; }
  .projects-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .section-header { margin-bottom: 40px; }
  .skills-grid--2 { max-width: none; }

  .footer {
    padding: 40px 0 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 28px;
  }
  .footer-brand {
    grid-column: auto;
  }
  .footer-brand p { max-width: none; }
  .footer-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 16px;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .skills-grid, .skills-grid--2, .skills-grid--4 { grid-template-columns: 1fr; }
  .about-card { padding: 24px; }
  .contact-form { padding: 24px; }
  .back-to-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
  .timeline { padding-left: 32px; }
  .timeline-marker { left: -32px; }

  .navbar { padding: 0 16px; }
  .nav-logo-text { font-size: 1.05rem; }
  .footer-nav { grid-template-columns: 1fr; }
  .footer-copy { font-size: 0.8rem; padding-top: 20px; }
}